Lull 944E-42 Service Manual - Manual (Page 424)

Hydraulic System
8.172 Model 644E-42/944E-42 Rev. 6/04
22. Apply a light coating of graphite grease to the new
square cross section o-ring (1) and carefully install
into the groove in the ported section (2). Be careful
that the o-ring does not twist in the groove. The o-
ring must be flat in the groove for proper sealing of
the pump when assembled.
23. Coat both the new seal gland (3) and new plastic
seal retainer (4) with graphite grease. Carefully
install the seal gland in the groove in the seal
retainer, make sure the seal gland is seated
completely in the seal retainer.
24. Coat the seal cavity area in the ported section (2)
with graphite grease to hold the new seals in place
during assembly.
25. Install the assembled seal gland and seal retainer in
the cavity in the ported section (2). Be sure the
plastic seal retainer (4) is facing away from the
ported section. Very carefully press this assembly in
place until it is firmly seated in the machined recess.
This assembly must be seated completely in the
recess to allow proper installation of the bronze wear
plate (5).
26. Lubricate the steel side of the bronze wear plate (5)
with graphite grease and install over the seal retainer
and seal gland assembly. When properly installed
the bronze face will be next to the gears and flush
with the surface of the ported section. Lightly oil the
bronze side of the wear plate with clean hydraulic oil.
27. Line up the alignment notches or the alignment
marks on the ported section and the front center
section. Slide the front center section (6) onto the
studs (7). Make sure all the seals and wear plates
have stayed in their proper position. It may be
necessary to use a plastic mallet to seat the front
center section onto the ported section.
28. Lubricate the drive gear (8) with clean hydraulic oil.
Very carefully insert the shaft through the wear
plate (5).
29. Lubricate the driven gear (9) with clean hydraulic oil
and install the gear through the wear plate (5) and
into the ported section (2). Align the marks on the
gear teeth and push all the way into the ported
section.
MM3561
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